Adds a toolbar item or items.

<div class="definition">
    add(items)
</div>

<div class="arguments">
    <table>
    <tr>
        <td>items</td>
        <td><b>object</b> or <b>array</b>, toolbar items to add</td>
    </tr>
    </table>
</div>

Returns <i>undefined</i>.

<h4>Description</h4>

The <span class="argument">items</span> argument can be either an object or array of objects. If it is an object it
represents a toolbar item that will be added to <a class="property" href="w2toolbar.items">.items</a> array.
If it is an array then each element of the array will be treated as a separate toolbar item object.
<div style="height: 10px"></div>

If you have toolbar defined in the following way:
<textarea class="javascript">
let toolbar = new w2toolbar({
    name  : 'toolbar',
    items : [
        { type: 'check',  id: 'item1', text: 'Check', icon: 'icon-page', checked: true },
        { type: 'radio',  id: 'item3',  group: '1', text: 'Radio 1', icon: 'icon-add' },
        { type: 'radio',  id: 'item4',  group: '1', text: 'Radio 2', icon: 'icon-add' }
    ]
});
</textarea>

You can add toolbar items:
<textarea class="javascript">
w2ui.toolbar.add({ type: 'radio',  id: 'item31',  group: '1', text: 'Radio 3', icon: 'icon-add' });
// or
w2ui.toolbar.add([
    { type: 'radio',  id: 'item5',  group: '1', text: 'Radio 5', icon: 'icon-add' },
    { type: 'radio',  id: 'item6',  group: '1', text: 'Radio 6', icon: 'icon-add' },
    { type: 'radio',  id: 'item7',  group: '1', text: 'Radio 7', icon: 'icon-add' }
]);
</textarea>
